Has anyone successfully configured DirectAccess to RainMachine Pro-8 with an ASUS router (RT-AC68/U)?  I have configured DDNS and port forwarding (router WAN port 8080 forwarded to RainMachine port 8080) on the router and installed a "Let's Encrypt" certificate.  I can log into the router by using its DDNS name and port number and by using its WAN IP address and port number.  But I cannot access the RM, neither using the router's DDNS name and port 8080, nor using the router's WAN IP address and port 8080.

Any help appreciated!